Need an extension lead, can it handle my computer?

[nagisaKei]

The socket that was where my computer is is messed up so i'm using another one next to my bed and i've set out to buy a 3m extension: https://www.amazon.co.uk/dp/B0716ZMQFD/ref=sspa_dk_detail_1?psc=1
I realised that I would need to get the Amps/Wattage for my 2 monitors & with my psu but I wasn't sure if i was doing my calculations right or how much my outlet can handle. So I would appreciate a second,third and fourth opinion specs below.

this is what i got so far although im not sure what's right and what's not...

outlet: 15A(?)
extension: 10A(?)
psu: 550@90% = 550/240=2.29A = 2.3A (yeah. not sure about this one)
monitor: 2x140W = 280+550=830W Voltage= 240V+264V=504V

Voltage = Psu = 240V+504V = 744V
Amp = 830/744=1.12A+2.3A=3.42A
Total:
PSU@90% + Both Monitors =830W,504V,3.42A?

The amps seem a little low... so thanks for your wisdom in advance
------------------------------------------------------------
Asus VG278HV 27" Gaming Monitor 114Hz
EVGA Supernova G2 550W Gold PSU
BenQ GL2250HM 21.5" Monitor 2ms
------------------------------------------------------------
Intel i7 4790
Corsair H110i V2
1TB 3.5" Western Digital Blue HD
Corsair Carbide Clear 400C Case
2TB Seagate Barracuda Sata III HD
HyperX Fury Black 16GB DDR3 RAM
MSI Z97 PC Mate Z97 Mobo
Logitech G430 Headset
Corsair K70 Rapidfire Cherry Keys
Wacom CTL-490DW-S Intuos GraphicTablet
Razer Deathadder Chroma Mouse

 

[13thmonkey]

you don't add voltages

so worst case 140Wx2 + 550W/0.9 = 611 = 891W
So if you are in the UK. 891/220V (we're really on 220V now and it gives you a more worst case scenario).

891/220= 4.05Amps. You are fine. A 10amp extension will cope with anything except, ovens, irons, kettles, toasters, heaters.

 

[nagisaKei]

you don't add voltages

so worst case 140Wx2 + 550W/0.9 = 611 = 891W
So if you are in the UK. 891/220V (we're really on 220V now and it gives you a more worst case scenario).

891/220= 4.05Amps. You are fine. A 10amp extension will cope with anything except, ovens, irons, kettles, toasters, heaters.

Thanks!, this is exactly what I wanted to hear.

I don't want to set the house on fire at one point due to my recklessness so I appreciate giving me some piece of mind

 

[13thmonkey]

however your 'screwed up socket' is more of a concern.

 

[nagisaKei]

however your 'screwed up socket' is more of a concern.

I've only got a power line adapter connected to that outlet and it works fine. However if I plug anything else in the outlet will overheat. So I use a different outlet which is fine I think

 

[13thmonkey]

you need to fix that outlet, that should not happen.